Shows the organic origins of plastics and natural substances; synthesis of plastics from natural substances; differences between thermosetting and thermoplastic materials; compounding platics to provide desired properties in products forms in which plastics are produced and typical plastics products.
byDivision of Visual Aids U.S. Office of Education and Federal Security Agency
Subtitle: Automotive Operation & Maintenance Preventive Maintenance No. 2. Discusses the importance of taking good care of automotive electrical systems. Provides step-by-step guidance on tests to run. Animated diagram of the individual components of the electrical system.